Sawiwg-machine



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l if" f UNITED STATES PATENT OFFICE.

R. B. BROIVN, OF CAMBRIDGE, VERMONT.

SAWING-MACHINE.

Specification of'Letters Patent No. 26,746, dated January 1D, 1860.

To all whom t may concern:

Be it known that I, R. B. BROWN, of Cambridge, in the county of Lamoille and State of Vermont, have invented a new and Improved Sawing-Machine; and I do hereby declare that. the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l, is a vertical section of a sawing.

machine constructed according to my invention, Fig. 2, indicates the plane of section; Fig. 2, a vertical section of the same, taken in the line y, y, Fig. l; Fig. 3, a section of the same showing the operation or function of one part of the invention.

Similar' letters of reference indicate corresponding parts in the several ligures.

To enable those skilled in the art to fully understand and construct my invention I will proceed t0 describe it.

A, represents a framing which may be constructed in any proper way to support the Working parts ofthe machine.

B, is a saw sash which is fitted in proper guides a, and has a reciprocating movement given it by means of a crank C, and connecting rod D.

E, is a saw fitted in the sash B, and toothed at each side as shown clearly in Fig. l.

In the lower part of the framing A, a shaft F, is placed, said shaft having a pinion b, placed on it, which pinion gears into a rack c, attached to the under side of a carriage G, which is fitted on a proper guide (Z, in the framing. On one end of the shaft F, two ratchets cl, f are placed, the teeth e, of one ratchet being in a reverse position to those f, of the other, as shown clearly in Fig. l.

Gr', I-I, represent two pawls, which engage respectively and alternately with `the ratchets d, CZ. The pawls are attached by cords c, c', to a lever I, in the upper part of the framing A,-f, being the fulcrum pin of said lever. Each pawl Gr', H, is attached to a lever, both of which are shown in Fig. l. The pawl H, has its lever J, connected at its lower end to one end of a rod K, which is attached at its opposite end to the lower end 0f a lever L, which is secured to a rock shaft M, which receives its motion from the sawsash B, by means of an arm g, and link It, as shown clearly in Fig. l.

In the framing A, and parallel with the carriage G, a bar N, is placed, said bar resting on a semi-elliptic spring O, which, as well as the bar N, is fitted in a Vroper bearing P. At each end of the bar h there is a projection e', at right angles to it, and to the end of each projection a wheel j, is attached. These wheels j, y', are beveled at their back sides, as shown clearly in Fig. 2. The bar N, has a pin c, passing through its center, the ends of said pin fitting in vertical guide slots Z, see Fig. 3.

The operation is as follows The log to be sawed, shown in red, is placed on the carriage G, and properly secured thereon by dogs m, attached to blocks a, as usual. Power is applied to the crank shaft in any proper manner, and as the saw moves up and down a feed motion is communicated to the carriage Gr, through the medium of the arm g, rock shaft M, lever L, rod K, lever J, pawls G, H, and ratchets d', d, a reciprocating movement being given the carriage by shifting the lever I, at the end of each movement of the carriage, so that the pawls G, H, will gear alternately into the ratchets d, d, one pawl of course rotating the shaft F, in a reverse direction to the other.

The saw E, in consequence of being toothed at each edge or side, cuts while the log is moving in either direction, and the wheel y', at the back of the saw E, works into the saw kerf and operating like a wedge forces out the board from the log so that it cannot be marred by the action of the teeth at the back or opposite edge of the saw. The other wheel j, bears against the under side of the log and thereby keeps the one first mentioned within the saw kerf. The spring O, allows the wheel at the under side of the log to yield or give to compensate for the inequalities of the surface of the log. The wheels j, y', enter the saw kerfs alternately, the one which acts as a wedge when the log is moving in one direction and the other as a roller below the log, have their condition reversed when the movement of the log is reversed.

I am aware that reciprocating saws have been provided with teeth at both edges or sides so as to cut as the log moved in either direction, and I am also aware that circular wedges have been employed to throw ofi1 the board from the log while the former was being Asavved therefrom. I therefore do not rock shaft M, levers L, J, and rod K, subclaim broadly and irrespective Vof the arstantially as shown and described.

rangement herein shown such devices, but, 2. The Wheels j, j, when attached to the having thus described my invention yielding bar N, and arranged to operateV as 5 What I do claim as new and desire to sel described, for the purpose of keeping the 15 i cure by Letters Patent, is- Work from the saw as it is cut from the log.

l. Operating the carriage Gr, by means of R. B. BROWN. i

the pavvls G, H, connected With the adjust- Witnesses: ing lever I, and actuated from the saw-sash HENRY STOWELL,

l0 B, through the medium of the link la, arm g, ELIAS BLAIR, Sr. l 

